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Asked by Komal Last Modified
Answer 
force exerts deceleration in body which can be find by
F=ma
52=20xa
a=2.5ms-2
the deceleration is 2.5ms-2
to find time taken to stop the mass, we can use newton equation of motion v=u+at
0=15-2.2t
t=15/2.5
t=6s.
therefore it would take 6 seconds to stop the mass
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